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    <title>
      Viewing runtime exceptions
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    <h1>
      Viewing runtime exceptions
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    <p>
      If an expression you evaluate causes a runtime exception, the exception will be reported in the editor. For example:
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    <p>
      Type and select the expression <code>Object x = null; x.toString()</code> in the editor and click <strong>Display</strong> in the toolbar.
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    <p>
      The error message:
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    <p>
      <em>An exception occurred during evaluation: java.lang.NullPointerException</em>
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    <p>
      will be displayed in the editor.
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    <h3 class="related">Related concepts</h3>
      <a href="../concepts/concept-java-editor.htm">Java editor</a>
    <h3 class="related">Related tasks</h3>
      <a href="task-display_evaluation_result.htm">Displaying the result of evaluating an expression</a><br>
      <a href="task-inspect_evaluation_result.htm">Inspecting the result of evaluating an expression</a><br>
      <a href="task-executing_an_expression.htm">Executing an expression</a>
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